Square O-Ring (ID:18 mm, CS:2 mm, OD:22 mm), 240PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
R-210 Square O-Ring (ID: 3/4", CS 1/8", OD 1"), 4PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces..
.R-347 Square O-Ring (ID: 4 1/4", CS 3/16", OD 4 5/8"), 60PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.